Castle of Chulilla Monument · Chulilla, Los Serranos, Valencia The castle of Chulilla, also called castillo Relámpago (Lightning Castle), crowns the hill that dominates the town and is the embryonic nucleus of the settlement: a Roman-era cistern survives, and under Muslim rule it was one of the most important castles in the region, together with that of Alpuente, tasked with controlling the routes through the valley and giving shelter to the nearby alquerías (hamlets). After the Reconquest and its incorporation into the Crown of Aragon, it was remodelled in the 14th, 15th and 16th centuries, and used as a seigneurial residence and later as a prison for clergymen. In the Carlist Wars of the 19th century it served the Carlist troops three times, and the final siege by the government army began its ruin. It preserves an outer wall, a barbican tower, a circular bastion, corner towers and four cisterns. Photo: Falconaumanni (CC BY-SA 2.5 es) What to see and do in Chulilla